package com.mygodp.service.impl;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;

import com.baomidou.mybatisplus.core.toolkit.BeanUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.mygodp.dto.LoginFormDTO;
import com.mygodp.dto.Result;
import com.mygodp.dto.UserDTO;
import com.mygodp.entity.User;
import com.mygodp.mapper.UserMapper;
import com.mygodp.service.IUserService;
import com.mygodp.utils.RedisConstants;
import com.mygodp.utils.RegexUtils;
import com.mygodp.utils.UserHolder;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.mygodp.utils.RedisConstants.*;
import static com.mygodp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {

        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合,返回错误信息
            return Result.fail("手机号格式错误!");
        }
        //3.符合,生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.debug("当前验证码："+code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合,返回错误信息
            return Result.fail("手机号格式错误!");
        }
        //2，校验验证码
        String code = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if(code==null||!code.equals(loginForm.getCode())){
            return Result.fail("验证码错误!");
        }
        //3.根据手机号查询用户 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        if(user==null){
            //4.用户不存在，创建新用户，保存到数据库
           user = createNewUserWithPhone(phone);
        }

        //生成token
        String token = UUID.randomUUID().toString(true);


        //5.将user对象转成Hashmap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //自定义复制，userDTO中id是Long 直接转成String会报错，需要自定义设置将属性转为String
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                                    .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        String tokenKey=LOGIN_USER_KEY+token;

        //存到redis中
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);

        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.HOURS);

        //返回token
        System.out.println("token"+token);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前用户信息
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();

        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+ userId + keySuffix;

        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前用户信息
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+ userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字 BITFIELD sign:30:202504 GET u30 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result==null||result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null || num==0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count =0;
        while (true){
            //6.1 让这个数字与1做与运算，得到数字的最后一个bit位，判断这个bit位是否为0
            if((num & 1)==0){
                //为0 说明未签到，结束
                break;
            }else {
                //如果不为0，说明已签到，计数器+1
                count++;
            }
            //把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }

        return Result.ok(count);
    }

    private User createNewUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        user.setCreateTime(LocalDateTime.now());
        user.setUpdateTime(LocalDateTime.now());
        save(user);
        return user;
    }
}
